With this model, Shimano and the cycling community celebrate the rebirth of the DA2 technology on their top of the range. And they do it at the highest level. Thanks to modern wireless control, impeccable functionality, to 12 -speed transmission and the usual excellent construction quality, you can switch from one victory to another and seriously test competition. The advantages of the electronic gearbox are evident: a simple pressure of a button is enough for the chain to flow from one pign to another in a fraction of a second, regardless of the situation, without delays or efforts. The high -quality XTR DERAGERATORE DERAGERATOR is synonymous with absolute precision. In combination with the Hyperglide+boxes, it offers an unprecedented and practically silent quality of change. The concept of stabilization of the Shadow chain, further evolved and called Shadow ES here, allows a very slender design and prevents the blow of the chain on the most rough terrain. The developers paid particular attention to robustness. The narrow and cuneo -shaped design of the rear derailler, which offers 23 mm more of light from the ground, and the smooth and resistant surface significantly reduce the risk of direct impacts, allowing the obstacles to slide away. However, if stones or roots are striking, the gear cage can move towards the inside thanks to the RD Protection protection function, and then automatically return to the original position. All this happens so quickly that the cyclist does not notice it and can continue to pedal without slowing down. In addition, the closed wheels of the change effectively reject branches and debris. In addition to all the visual and technical advantages, you can also appreciate the reduced weight, obtained thanks to an intelligent and elegant choice of materials, with aluminum and carbon as protagonists.